Automobile start-stop power supply reference design

This automotive start−stop power supply reference design describes the operation and performance for a typical pre−boost application needed in various automotive applications like ADAS, gateway and infotainment. It ensures proper supply of all subsequent regulators and therefore uninterrupted operation of the application, even at significant input voltage drops down to 1.5 V caused by cold cranking.

The design demonstrates the NCV887801 controller capabilities and incorporates a NVMFS5C442NL 40 V N−channel FET and a NRVB460MFS 60 V Schottky diode for the power stage. It is intended for the power supply designer to adopt the circuit directly into a typical system design, making only minimal component changes based on system requirements.

The design is meant to be a complete solution, but it also provides access to key features of the NCV887801. These include automatic wake up, status pin diagnostic function, low IQ, ±2% output accuracy over temperature range, peak current mode control with integrated slope compensation and cycle−by−cycle current limit protection with hiccup−mode overcurrent protection.